Digi CM - Manual (Page 63)

Configuring Security and Authentication
Chapter 7 63
Chain rule - The Chain rule determines whether access from the hosts is
allowed or not. It can be one of these two values:
ACCEPT : access allowed
DROP :
access not allowed
A user can add a new IP filtering rule by entering the values for the parameters
and clicking the
Add button on the right hand side of the table. A user can
remove a rule by using the Remove button. After having finished editing the
table be sure to save the settings to flash using the Save to flash button or to
save and apply them using the Save & apply button. Be aware that the changes
need to be applied before becoming active.
This screen shot shows 5 IP rules that have been established.
Rule #1 defines SSH access to the Digi CM (port 22). The Normal option
specifies that the rule applies to all addresses listed. The rule says to Accept
traffic from these addresses for Port 22.
Rule #2 defines Telnet access to the Digi CM (port23). The Invert option
specifies that the rule applies to all addresses except those listed. The rule
says to Drop traffic from all addresses not listed.
Rule #s 3, 4,and 5 define access to the Digi CM using HTTP (port 80).
However, rule 3 blocks all traffic, rule 4 allows access from IP address
192.168.1.0. and rule 5 allows access from IP address 192.168.2.0.